let c1,c2,c3;
let Base64=
  {
    _keyStr:"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
    encode:function(e){
      let t="";
      let n,r,i,s,o,u,a;
      let f=0;
      e=Base64._utf8_encode(e);
      while(f<e.length){
        n=e.charCodeAt(f++);
        r=e.charCodeAt(f++);
        i=e.charCodeAt(f++);
        s=n>>2;
        o=(n&3)<<4|r>>4;
        u=(r&15)<<2|i>>6;
        a=i&63;
        if(isNaN(r)){
          u=a=64
        }else if(isNaN(i)){
          a=64
        }
        t=t+this._keyStr.charAt(s)+this._keyStr.charAt(o)+this._keyStr.charAt(u)+this._keyStr.charAt(a)
      }
      return t
    },
    decode:function(e){
      let t="";
      let n,r,i;
      let s,o,u,a;
      let f=0;
      e=e.replace(/[^A-Za-z0-9+/=]/g,"");
      while(f<e.length){
        s=this._keyStr.indexOf(e.charAt(f++));
        o=this._keyStr.indexOf(e.charAt(f++));
        u=this._keyStr.indexOf(e.charAt(f++));
        a=this._keyStr.indexOf(e.charAt(f++));
        n=s<<2|o>>4;
        r=(o&15)<<4|u>>2;
        i=(u&3)<<6|a;
        t=t+String.fromCharCode(n);
        if(u!=64){
          t=t+String.fromCharCode(r)
        }
        if(a!=64){
          t=t+String.fromCharCode(i)
        }
      }
      t=Base64._utf8_decode(t);
      return t
    },
    _utf8_encode:function(e){
      e=e.replace(/rn/g,"n");
      let t="";
      for(let n=0;n<e.length;n++){
        let r=e.charCodeAt(n);
        if(r<128){
          t+=String.fromCharCode(r)
        }else if(r>127&&r<2048){
          t+=String.fromCharCode(r>>6|192);
          t+=String.fromCharCode(r&63|128)
        }else{
          t+=String.fromCharCode(r>>12|224);
          t+=String.fromCharCode(r>>6&63|128);
          t+=String.fromCharCode(r&63|128)
        }
      }
      return t
    },
    _utf8_decode:function(e){
      let t="";
      let n=0;
      let r= c1 = c2=0;
      while(n<e.length){
        r=e.charCodeAt(n);
        if(r<128){
          t+=String.fromCharCode(r);
          n++
        }else if(r>191&&r<224){
          c2=e.charCodeAt(n+1);
          t+=String.fromCharCode((r&31)<<6|c2&63);
          n+=2
        }else{
          c2=e.charCodeAt(n+1);
          c3=e.charCodeAt(n+2);
          t+=String.fromCharCode((r&15)<<12|(c2&63)<<6|c3&63);
          n+=3
        }
      }
      return t
    }
  }
export default Base64;
